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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 8
 4
 2

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 N12 : N22.
 N1 : N2.
 none.
 1 : 1.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 reduced starting current.
 more starting time.
 smoother acceleration.
 more starting torque.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 115 V
 460 V
 200 V

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 1
 100
 10

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Electrical Machines
The back emf produced in a dc motor depends on

  none of these.
  P.
  Z.
  P and Z.

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